RT Journal Article SR Electronic T1 Volatility and futures JF The Journal of Portfolio Management FD Institutional Investor Journals SP 20 OP 22 DO 10.3905/jpm.1988.409144 VO 14 IS 2 A1 Hans R. Stoll A1 Robert E. Whaley YR 1988 UL https://pm-research.com/content/14/2/20.abstract AB